The Swim Smooth Advanced CSS Calculator allows you to input your 400 and 200 freestyle times to simply calculate your CSS pace per 100. Doing so allows you to determine a single pace benchmark that all other training zones can be based off. If this number improves, you can be assured that you’ll be well on the road to swimming faster over any distance above 400.

In addition to the Basic Calculator, with the Advanced CSS Calculator the GURU will determine your Performance Predictions over a sequence of increasing distances and popular event distances, determine your 10 Week CSS Development Plan, calculate your Red Mist Cycles and allow you to save the information as part of your record such that every session you undertake will have the exact training pace determined for you to elicit the greatest gains.